Re: Working with decimals

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Date	2014-08-24 08:53 +1000
Subject	Re: Working with decimals
From	Chris Angelico <rosuav@gmail.com>
Newsgroups	comp.lang.python
Message-ID	<mailman.13364.1408834894.18130.python-list@python.org> (permalink)

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On Sun, Aug 24, 2014 at 8:47 AM, Joshua Landau <joshua@landau.ws> wrote:
> On 23 August 2014 23:31, Chris Angelico <rosuav@gmail.com> wrote:
>> On Sun, Aug 24, 2014 at 7:47 AM, Joshua Landau <joshua@landau.ws> wrote:
>>> So for one "import math" should never go inside a function; you should
>>> hoist it to the top of the file with all the other imports.
>>
>> I'd say "never" is too strong (there are times when it's right to put
>> an import inside a function), but yes, in this case it should really
>> be at the top of the function.
>
> But do any of them apply to "import math"?

Yep. If you have only one function that will ever use it, and that
function often won't ever be called, then putting the import inside
the function speeds up startup. Anything that cuts down on I/O can
give a dramatic performance improvement.

Oh, and when I said "top of the function", what I really meant was
"top of the file", but I think (hope!) people figured that out. Sorry
for the braino.

>> However, you won't need the import at all if you let the formatting
>> function do the rounding for you.
>
> Can that floor?

I'm not sure, dig into the format spec and see! But was flooring
actually a critical part of the problem, or is another sort of
rounding just as good?

ChrisA

Thread

Working with decimals Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-08-23 13:47 -0400
  Re: Working with decimals Joel Goldstick <joel.goldstick@gmail.com> - 2014-08-23 14:21 -0400
    Re: Working with decimals Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-08-23 15:07 -0400
      Re: Working with decimals Joel Goldstick <joel.goldstick@gmail.com> - 2014-08-23 15:22 -0400
      Re: Working with decimals Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-08-23 20:24 +0100
        Re: Working with decimals Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-08-23 15:48 -0400
          Re: Working with decimals Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-08-23 21:31 +0100
  Re: Working with decimals Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-08-23 17:13 -0400
    Re: Working with decimals Joshua Landau <joshua@landau.ws> - 2014-08-23 22:47 +0100
    Re: Working with decimals Chris Angelico <rosuav@gmail.com> - 2014-08-24 08:31 +1000
    Re: Working with decimals Joshua Landau <joshua@landau.ws> - 2014-08-23 23:47 +0100
    Re: Working with decimals Chris Angelico <rosuav@gmail.com> - 2014-08-24 08:53 +1000
    Re: Working with decimals Larry Hudson <orgnut@yahoo.com> - 2014-08-24 00:04 -0700
      Re: Working with decimals Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-08-24 10:58 -0400
      Re: Working with decimals Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-08-24 11:12 -0400
        Re: Working with decimals Larry Hudson <orgnut@yahoo.com> - 2014-08-24 14:24 -0700
          Re: Working with decimals Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-08-24 19:07 -0400
    Re: Working with decimals Joshua Landau <joshua@landau.ws> - 2014-08-24 20:12 +0100
    Re: Working with decimals Ian Kelly <ian.g.kelly@gmail.com> - 2014-08-24 13:17 -0600
    Re: Working with decimals Ian Kelly <ian.g.kelly@gmail.com> - 2014-08-24 13:19 -0600
    Re: Working with decimals Joshua Landau <joshua@landau.ws> - 2014-08-24 20:25 +0100
    Re: Working with decimals Joshua Landau <joshua@landau.ws> - 2014-08-24 20:29 +0100
      Re: Working with decimals Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-08-25 12:16 +1000
        Re: Working with decimals Chris Angelico <rosuav@gmail.com> - 2014-08-25 12:27 +1000
          Re: Working with decimals Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-08-25 12:51 +1000
            Re: Working with decimals Chris Angelico <rosuav@gmail.com> - 2014-08-25 13:01 +1000
    Re: Working with decimals Ian Kelly <ian.g.kelly@gmail.com> - 2014-08-24 13:37 -0600
    Re: Working with decimals Ian Kelly <ian.g.kelly@gmail.com> - 2014-08-24 13:40 -0600
    Re: Working with decimals Joshua Landau <joshua@landau.ws> - 2014-08-24 20:49 +0100
  Re: Working with decimals Joshua Landau <joshua@landau.ws> - 2014-08-23 22:52 +0100
    Re: Working with decimals Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-08-23 18:03 -0400

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